Device for tightening damaged tubes of boilers.



- c. F. H. DITTMANN. DEVICE FOR TIGHTENING DAMAGED TUBES 0F BOILERS. I

APPLICATION-TILED 1130.3, 1902.

Patented Apr. 26, 1910.

" Urrnn s'rna grnrnr OFFICE.

CHRISTIAN FRIEDRICH H. DITTMANN, OF HAMBURG, GERMANY, ASSIGNOR TO THEFIRM OF DITTMANN & WAGNER, OF HAMBURG, GERMANY.

DEVICE'FOR TIGI-ITENING DAMAGED TUBES OF BOILERS.

To all whom it may concern:

Be it known that I, CHRISTIAN FRmDRIoH HANs DrrrMANN, a subject of theGerman Emperor, and resident of Hamburg, Germany, have invented certainnew and useful Improvements in Devices for Tightening the Damaged Tubesof Boilers, of which the following is a specification.

This invention relates to an improved device for tightening the tubes ofsteam boilers, when damaged, in an easy and very quick manner. v

The accompanying drawing represents the improved device.

Figure 1 is a view of the same, while Figs. 2, 3 and 4 show the same inthree different positions when being used on or applied to the boilertube; Figs. 1*, 8 and 46* being underside views of Figs. 1, 8 and 4trespectlvely. Fig. 5 is a cross section on the line w:v of Fig. 4, on alarger scale.

The device comprises a rod a which is somewhat longer than the boilertube to be tightened. One end of said rod is provided with screw-threadsand carries thereon a nut I) while a cone 0 can be shifted over the rod.The other end of said rod is divided into three long branches (2, e, fwhich possess a certain spring action and carry each a loose part of acone which is divided into three equal sections 9, h, 2'. Each branch isprovided with a step in such a way that when the cone sections restagainst said steps they lie behind each other as shown in Figs. 1 and 2.The branches terminate each in a head 0 to prevent the cone sectionsfrom falling off. The ends of the branches receiving the cone sectionsare of triangular cross section (Fig. 5), so that the same can beshifted but not turned thereon, the cone sections being so disposed onthe branches that when they are shifted upon the heads 0 they lietightly against each other andthus form a full cone.

The device is used in the following way Upon a boiler tube gettingloose, the rod is with its branches in front pushed through the tubefrom the front of the boiler (see arrow, Fig. 2), the passage of thebranches therethrough being allowed owing to the cone sections thereonbeing placed behind Specification of Letters Patent.

Application filed December 3, 1908.

Patented Apr. 26, 1910.

Serial No. 465,873.

each other. The rod is shifted so far into the tube that the three conesections project beyond the rear orifice m of the same, whereupon thebranches jump asunder owing to their spring action. Upon the rod beingagain drawn to the front (see arrow, Fig. 3), first the cone section 9and then the cone section 2' are shifted toward their heads 0, untilthey lie both tightly against the cone section 72, and form thus a fullcone which projects then somewhat from the rear into the boiler tubeorifice m. Upon this, the full cone 0 is shifted on the front end of therod at until it projects somewhat into the front orifice 7c of theboiler tube, the nut I) being then tightened whereby the rear conesections g, h, i, as well as the front cone 0 are firmly pressed uponthe orifices m and 7c and the boiler tube is thus perfectly tightened.

To facilitate the operation of shifting the rod a into the boiler tubeand to move it to and fro therein in order to bring the cone sections g,h, 2 into the proper position, a prolongation Z may be screwed on thefront end of the rod (1, the same being again taken off when the deviceis in proper place.

To again remove the device from the tube when the boiler is to berepaired, the heads 0 of the branches d, e, f must be cut off whereuponthe device can be drawn out to the front leaving the rear cone sectionsin the rear orifice of the tube from where they can be taken out byhand.

Having fully described my invention, what I claim and desire to secureby Letters Patent is A device for tightening the damaged tubes ofboilers, comprising in combination, a rod adapted to be shifted throughthe boiler tube to be tightened and having screw threads on one end, anut on said screwthreads, a cone loosely arranged over saidscrew-threaded end and designed to fit one orifice of the boiler tube tobe tightened, three long branches integral with the opposite end of saidrod and having a certain spring action, three equal cone sectionsloosely arranged on said branches and adapted when shifted together toform a full cone designed to fit the other orifice of the boiler tube tobe tightened, a step mv hand in the presence of two subscribing on eachbranch so disposed that $16 coie secl- Witnesses.

tions when restin thereon lie ehin eaci other, and a head on each branchto secure CHRISTIAN FRIEDRICH DITTMANN' the cone sections thereon, allfor the purpose itnesses:

set forth. ERNEST H. L. NIUMMENHOFF,

In testimony whereof I have hereunto set OTTO W. HELLMRICH.

